Alert archive / Illinois / Tornado Warnings in 2003

Tornado Warning 46, NWS Quad Cities, IA

August 1, 2003Henry County, Illinois

NWS Quad Cities, IA issued this tornado warning at Aug 1, 2003, 4:05 PM CDT for Henry County, Illinois. It was in force for 55 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 1, 2003, 4:05 PM CDT (21:05 UTC)
Expired: Aug 1, 2003, 5:00 PM CDT
In force: 55 min
Issued by: NWS Quad Cities, IA
Area: Counties, with a storm outline in the text

County Henry County, IL

The radar

The Quad Cities radar (KDVN), 41 km from the middle of the area, began a volume at 21:06 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Aug 1, 2:00 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 9.1 hours before the alert went out and 37 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1279 J/kg
Mixed-layer CIN: -100 J/kg
Mixed-layer LCL: 1232 m above ground
0-6 km bulk shear: 32 kt
0-1 km storm-relative helicity: 73 m²/s²
0-3 km storm-relative helicity: 56 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

881 
WFUS53 KDVN 012105
TORDVN
ILC073-012200-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE QUAD CITIES IA IL
405 PM CDT FRI AUG 1 2003

THE NATIONAL WEATHER SERVICE IN THE QUAD CITIES HAS ISSUED A

* TORNADO WARNING FOR...
  HENRY COUNTY IN NORTHWEST ILLINOIS

* UNTIL 500 PM CDT

* AT 401 PM CDT...TRAINED SPOTTERS REPORTED A FUNNEL CLOUD OVER
  WOODHULL...OR 11 MILES SOUTHWEST OF CAMBRIDGE...MOVING EAST AT 15
  MPH.

* THE TORNADO IS EXPECTED TO BE NEAR...
   NEKOMA BY 425 PM CDT.
   BISHOP HILL BY 440 PM CDT.
   GALVA BY 455 PM CDT.

THE SAFEST PLACE TO BE DURING A TORNADO IS IN A BASEMENT OR ON THE
LOWEST FLOOR OF A BUILDING IN AN INTERIOR HALLWAY OR ROOM.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 800 PM CDT FRIDAY
EVENING FOR SOUTHEASTERN IOWA AND NORTHWESTERN ILLINOIS AND NORTHEAST
MISSOURI.

LAT...LON 4114 9043 4146 9045 4153 9029 4159 9017
          4159 8986 4114 8986

$$

JAZ

The office that day

Everything else NWS Quad Cities, IA issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 1, 12:54 AM CDT	Severe Thunderstorm Warning	DVN	Carroll	51 min
Aug 1, 1:00 AM CDT	Severe Thunderstorm Warning	DVN	Jo Daviess, Stephenson	60 min
Aug 1, 2:20 AM CDT	Severe Thunderstorm Warning	DVN	Stephenson	55 min
Aug 1, 2:47 PM CDT	Severe Thunderstorm Warning	DVN	Mercer	43 min
Aug 1, 3:27 PM CDT	Severe Thunderstorm Warning	DVN	Mercer, Rock Island	48 min
Aug 1, 3:37 PM CDT	Severe Thunderstorm Warning	DVN	Putnam	53 min
Aug 1, 3:47 PM CDT	Severe Thunderstorm Warning	DVN	Henry	73 min

Nearby

Tornado Warnings in Illinois, 2003 Every tornado warning in 2003 Tornadoes in 2003

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.